Under normal husbandry management conditions, the sow can only produce 1.8-2 litters per year on average. How can we make the sow produce 2.5 litters per year, and how many litters will it produce? The author has explored a set of comprehensive technical measures in the production practice for many years, so that the experimental pig farm sows produce 5 litters for two years, 12-15 pigs per litter, and achieved better economic benefits. Its comprehensive technical measures are as follows:
1. Reasonably arrange seasoning
For the primiparous sows, one-to-two months of juvenile production will be born; With this arrangement, the sow can produce 2.5 litters a year and 5 litters a year, and most of them are breeding litters in spring and autumn with high reproductive survival rates.
2. Timely breeding pay attention to breeding technology
The boars and the sows to be paired are kept in the same pig house as much as possible, and the boars are rushed to the sow area every morning and afternoon for estrus identification or breeding. Sows are allowed to breed when the sow allows the boar to climb 9-30 hours or sow the back of the sow, and the sow stands still and shows a “static reflectionâ€. Native sows should be bred 2-3 days after estrus, and the introduced sows should be bred on the afternoon of the day of estrus or on the morning of the next morning. Hybrid sows should be bred on the afternoon of the second day after estrus. When mating, follow the principle of "early match with old, small with late, not old with small". For sows of different ages and cross combinations, boars of different breeds were selected for selection. In order to ensure that there is no missed match, the first-born and second-born sows are double-matched or repeated at 8-12 hours after the first-time breeding. Repeated mating is used for sows older than 3 months. Years of practice have proven that mating is carried out before feeding early and late, ensuring that the fertility rate is over 85%.
3. Breastfeeding and drug aphrodisiac
The first estrus of the sow during lactation is 2-5 days after childbirth. The second estrus of the sow is the best in the 24th day of mating. If the piglet is still not matched before weaning, it must be 3-5 after the weaning. Days of aphrodisiac, formula one: 50 grams of Vaccaria, motherwort, heather leaves of 30 grams, fed with fructose or spices feeding, once a day, even fed 5-7 days; formula two: remove the sow production After 1 to 3 hours of colostrum secretion, add 1 gram of streptomycin or 50,000 units of penicillin per 100 ml, subcutaneous injection of 15 ml per head once per day for 1 to 2 days; formula 3 :Tristimulus hormone is injected intramuscularly, 2-3 ml per head, or with promoted row No. 3, 100 micrograms per head; Formula 4: 250 grams of fresh leeks, fresh green onions 150 grams, fresh eucalyptus leaves, fresh peach leaves 100 grams each, 100 ml of rice wine, mixed with food, one dose per day, and even served 2-3 days. Practice has shown that after drug aphrodisiac, 94% of sows can advance to heat.
4. Baotu
After mating and conceiving, it should be kept properly throughout the pregnancy. The feed must be fed according to the principle of "two fine, medium thick", and requires quality, cleanliness, and banned feeds. When feeding, mix with light diarrhea, such as bran, to prevent constipation. When pregnant sows go in and out of the lap, they must be firmly slippery and avoid chasing. After breeding, it should be raised in a single circle. Under conditions, pregnant sows with first-born fetuses passing through the summer should be vaccinated with JE and parvovirus vaccines.
5. Collaborate
A small number of litters or two litters of piglets are allowed to have good maternal and lactating sows so that non-lactating sows can be bred earlier. When nesting, the litter of piglets must first eat colostrum in the ancestral litter, and then nest and mix.
6. Early weaning
According to experience, piglets are suitable for weaning at 35-40 days of age. Early weaning technique points: piglets eat enough milk, fixed teat, 2-3 days old intramuscular injection of 100-150 mg of dextran iron, 7-10 days of age with high-energy protein material and full-price pellet feed. Feeding is based on the principle of “fresh and delicious, with less amount of feedingâ€. In the winter and summer evenings, each meal is fed with 1 meal. Keep the environment clean, dry and warm during weaning, and keep raw materials and original rings after weaning.
7. Feeding
1 supplement feed
The sows with poor body condition increased their feeding volume to twice the normal amount 20 days before mating, and increased their 50% feeding amount 10-15 days before mating. . After feeding the sows, the rations are reduced to normal after mating so that the embryos do not die. Practice has proved that by supplementing feeds, the ovulation rate of sows can be increased, the number of litters can be increased by more than two, and the piglets can be guaranteed to be fully active and full.
2 vitamin supplementation
In the weaned sow diet, an additional vitamin K of 100 milligrams and vitamin E 200 milligrams were added, halved when fed to estrus, and fed continuously until 21 days after gestation. Pregnant sows add 1 gram of vitamin C per head per day for the first 7 days before farrowing. This avoids the suffocation of piglets due to bleeding.
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